Rock-drill.



S. FERGUSON ROCK DRILL.

APPLIUATION FILED AUG. 24. 190e.

Patented June 22, 1909.

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/J ATTORNEY S. FERGUSON.

ROGK DRILL.

APPLIGATION FILED AUG. 24, 190s.

Pah-,enten .111118221909 4 SHEETS-SHEET 2.

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ATTORNEY WI TNESSES:

S. FERGUSON.

ROCK DRILL. APPLIUATION FILED AUG. 24, 190s.

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ATTORNEY.

S. FERGUSON.

ROCK DRILL.

PPLIGATION FILED AUG. 24

Patented June 22, 1909.

4 SHEETS-SHEET 4.

Waf/wzaai ATTORNEY.

I line yV the drill proper which is preferablyforme of A gether y means of bolts-3;

`ceptilnle of various adjustments for purposes .VI I-VIII, of Fig. II.

vtions ,1' and 2 respectively, their meeting edgesbeing'preferably arranged on a horirATn'NT OFFICE.

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' lSEYMOUR 'Fraeuson or ecoToLAN, oAxaoA, Mexico.

BooK-DRILL.

To ali whom it may concern:

l 13e 1t known that LSEYMOUR FERGUSON, a .citizen of the United States of America, resid- 'lng at the city of Ocotolan, in the State of Oaxaca, Mexico, have invented certain new and useful Improvements in Rock-Drills, of which the following isafull, clear, and exact description, reference beinghad to the accompanying drawings, forming part of this specification. l

My invention relates to a newand useful improvement in rock drills, the same being particularly, but not necessarily desivned for mining purposes, andhas for its o -'ect to' produce an inexpensive and practica le device 'of lthat Acharacter and one which issushereinafter to' be explained.

The invention further consists in the novel features of construction, arrangement and combination of the 'several parts all of which will hereinafter be described and afterward pointed out 4in the claims.

Figure I is`r a side view artly in elevation and partly in section of t edrill casing, its support and .other partsA connected thereto, the drivingmechanlsm'bein omitted. Fig. II is a'vertical longitudine section of the drill casing, its contained arts and other arts connected thereto. ig. III is an enarged detail transverse section taken online III-#III of Fig. II. Fig. IV is an enlar ed detail transverse section taken on ylgine IV-IV of Fig. II. Fig. V is anenlar ed transverse section taken on line V-V of ig. I. Fi VI 'isa horizontal section taken on IJ-VL'ofFig. V. Fig. VII is an enlar ed transverse section taken on line VI -IVII, of Fig. II, the removablepiston head being omitted. Fig. VIII' is an enlar ed transverse section taken on line In'the drawings, A. designatesthe casin of.A

twosemicylindrical upper and lower seczontallane, said sections being secured to- 4l designates'a pair of sectional journal vboxes which arelocated in suitable recesses formed part in the upper sectiony 1 and art' Specification of Letters Patent..

Application filed August24, 1908. Serial No. 449,969.

in the lower section 2 of the casing A. T ese Patented June 22, 1909.

journal boxes receive the ends of a crank shaft 5 the throw of which crank shaft is journaled in a reciprocatory cross-head 6 which operates in suitable lon itudinal grooves 7 formed in each'section o the casing A. One end of the crank shaft 5 extends some distance beyond the side of the casing and has secured thereto in any suitable manner, a bevel gear Wheel 8 which is located ina suitable ear housing, one member`9 of which is provi ed with inwardly -disposed anges which fit, and are secured in place, between the 'ournal boxes 4 and the sections 1 and 2 oft e casing. This member 9 of the gear housing is formedwith an outwardly disposed annular mar inal flange 10 and surrounding said margine flange and-lapping over on the rear face of the member 9 is a ring 11 having an external screw thread 12.

13 designates the other member, or main portion, of the gear housing which has screw threaded connection with the ring 11. Diametrically opposite to each other, and extending at right angles to the axis of the crank shaft 5, are conical screw threaded bores 14 formed in the member 13 which are engaged by suitable conically shaped screw threaded bushings 15 and in which bushings is journaled a hollow shaft 16. This hollow shaft 16 has secured externally thereof a bevel pinion 17 properly positioned to be in mesh with the bevel gear wheel 8 before mentioned. The bore of the hollow shaft 16 is non-circular and is designed to receive a like shaped nen-circular driving shaft indicated in dotted lines in Fig. I, the rotation of which im arts, through the instrumentality of `holllbw shaft 16, bevel pinion 17, bevel gear wheel 8, and crank shaft 5 reciprocatory motion to the before mentioned cross-head 6.

18 designates apiston rod, secured to the forward end of the cross-head 6 in any suitable manner,which is provided upon its forward end with a hollow piston 19 o erable in= a cylindrical body 20, (see'Fig. I). lThis cylindricalA body is provided upon its forward end with an integral head 21 and u n its rearward end with a detachable hea 22 which latter is provided -with a stuffing box 23 through-which the piston rod 18 passes. The hollow piston 19, before referred to, has

detachably secured within it a cap or disk 24 wheel 25.

and between which of the hollow This ratchet wheel has secured to it a piston shaft 26 which passes through .a suitable bore formed i'n the disk 24, said piston shaft being arranged in 'axial alinementwith the piston and piston rod 19 and 18respectively. This piston shaft 26 is provided with a plurality grooves 27which have the appearance of the rifle-bore of a gun, s'aid ,spirally arranged grooves being designed to receive .complementary spirally arranged ribs formed in a l tube 28, in turn secured within a bore formed in one end of a tool carrying element or chuck 29, which chuck is secured to the integral head 21 of the cylinder 20. This chuck 29 passes through a conical bushing 30 located within, andnear the outer end of the casing A and extends some-distance there beyond,` the same being provided with a cylindrical bore formed in its outer end, which bore receives a section of tubing 31 which in turn is designed to receive the tool proper or chisel. y The tool proper or chisel is secured within the tubing 31 by means of a l spring actuated block 32 having an inclined upper face which is engaged by a wedge 33 interposed there between and a portion 29a The under face of this block 32 passes through suitable registering slots 34 formed in the tubing 31 and chuck 29, as willvbe clearly understood from an inspection of Figs. Il andVIII of the drawings.

The ratchet wheel 25 before referred to cooperates with aplurality of spring-actuated pivoted at one end berespectively of the hollow piston 19. These pawls or dogs'are of such a number relative to the number of teeth of the ratchet wheel, with which they coperate, that at least one of them will always, or'very nearly, be in engagement with some-one tooth of thevsaid ratchet wheel. t Y

Having nowdescribed the major arts of my improved drill, I willnow exlp operation of the device up ,to t is oint.

W'hen'the cross head is -diven forward y by i vthe throw' of the crank'shaftjln the manner previously described, the ,piston rod 1 8 and its carried piston head 19 are likewise moved forwardly, the latter operating within the cylindrical body 20, compressing thev airbetween the integral cylinder head 21 and the f certain degree,

piston disk 24.' After the air between'the elements 21 and 24 has beencompressed to a the movement' of the piston will cause the cylinder 20 to move forwardly thereby driving the chuck and Vits carried chisel outwardly, the latterefecting the desired end sought by this invention. When- -the piston head, carrying the ratchet wheel and its rifle grooved pistonshaft advances,

disk and the inner wall l these last two elements are caused to piston is located a ratchet l rotate in the l Fig. V l1,

of spirally arranged.

.formed on the lower section of ain' the lrendered non-rotatable in the bore 42.

tating will simply' move any or all of the pawls ont of its path of movement, and will permit said riiie grooved piston shaft to move inwardly into its rifled bore, the chuck and its carried chisel moving inwardly to the work in anon-rotatable manner. Now, when the cross-head and piston are moved rearwardly, said elements both being non-rotatable, the rifle grooved piston shaft is withdrawn from its rifle bored groove and as the ratchet wheel conjoined to said rifle grooved piston shaft is held against rotation in a direction opposite to the arrow in Fig. IV, by the pawls, the cylinder and its'conjoined chuck is caused to partly rotate, thereby causing the chisel to also partly rotate and prevent the cutting end thereof from striking against the rock, or other substance to be drilled, in the same spot in which it previously did when the piston and associate parts again move forwardly. n

35 designates a su port for the casing A and uponjvhich thev atter can be longitudinally adjusted in orderto advance the chisel lto the work. This support 35 is provided upon its under side with a base 36 designed to rest, and be pivotally mounted, upon a pedestal or tripod, not shown, whereby the device as an entirety can be moved to any desired, approximately, horizontal angle. The support 35is provided upon its upper face with inclined guide faces 37 designed to receive complementary inclined faces 38 the easing A, the said support being also provided with an offset 39 designed to receive guide strips-40 bolted or otherwise secured to the said casing A which'guide strip ,prevents any upward movement ofthe said casing relative to its support.

41' designates a downwardly extending lug formed preferably integral .with the lower section ofl the casing vided with a longitudinally disposed bore 42 and in which bore is arranged two internally screwthreaded bushings` .43 and44'. vThe bushing 44 is provided with an outwardly extending flange 45 which rests .against the forward end of thelug 41, said lange being formed with aiiat upper face 4.6 which rests against the flat face formed upon the .under face of the lower section of the casing A andk by whichconstruction the said bushing 4F14 11is e bushing 43 'is provided with an outwardly e extending flange 47 which rests against the A said lug being pro--vr of th lsella III of the drawings that the brought into registration with one of the 1c notches 49 a key or pin 50 is introduced into said notches and rotary movement of the 1 bushing is thereby prevented.

51 designates a feed screw which is arrangedpreferably below and parallel with the casing A, its forward end being journaled in a thrust-block 52 carried by the forward end of the support 35. This feed screw also engages the screw threaded bushings 43 and 44 mounted in the bore of the lug 4 1 and is provided with an integral collar 53. which acts as a stop to limit the outer movement of the casing A and its carried arts.

54 designates an operating andle or crank suitably secured to the rearmost end of the feed screw 51 and by which the latter is rotated in order to move the casing A for- ,wardly and backwardly. The conically shaped screw threaded'bushings 15 before yreferred to' are formed with a longitudinal slit or saw kerf 55 (see Fig. VI) whereby the inner bore thereof can be reduced in diame- -ter, when said bushings .are properly adjusted, in order to compensate for wear of therubbing surfaces there between and the hollow drive-shaft 16. These bushings are held in proper ad'usted position by means of a dog 15 pivote to the gear housing, which engage one of a plurality of notches 1 5b formedin the outer external ends of said bushin (see Fig. V). v

The Sushing 30 before referred to is made of two sections, held together against independent longitudinal movement relative to each other with dowel pins or holes (sce dotted lines in Fig. II) and when it is desired to Kcompensate for wear between the sections o f said bushing and the chuck, the upper seetion of the casing A is removed and the bushing as an entirety rotated in the proper direc- -tion to cause said bushing to adequately fit the chuck, after which the said u per section e casing is properly replace 56 designates a s )ring actuated bolt mounted in the. gear ousing which is designed to engage one of a plurality of notches formed in the outer face of the ring 11, thel purpose of which is to lock together the two elements, z'. e, the gear housing and ring 11. It will be observed from lan insV ection of Fig.A

di'iving shaft is permitted to occulpy varying degrees of angles relative to t e casing and its carried parts by simply partly rotating the geanv iousing proper relative to its support.

oted to the removable head 22 of the cylinder 20 one end of which engages one of a plurality of notches formed in the stuffing box gland, the purpose of said dog and its cooperating notches being to prevent the gland from unscrewing which would spoil the effectiveness of the packing.

In addition to what has already been said with reference to the elements which clamp the tool or chisel to thcI chuck 29, I might mention that the springs 3.2a upon which the block 32 rests are for the purpose of raising said block .clear of the tool or chisel when the wedge 33 is retracted, in order that the said tool or chisel will have free movement in the tubing 31 for its ready removal or insertion and furthermore that owing to the particular inclination of the said wedge 33 and the upper inclined face of said block 32 that the impact of said tool against its Work will tend to drive said wedge more tightly in place, thereby insuring against any accidental displacement of the said tool or chisel.

Referring again to the bushings 15 shown in Figs. V and VI of the drawing, it will be observed that I have formed a plurality of longitudinally disposed internally arran ed slits or saw kerfs l, the function of whic is to permit of the bushings having more elasticity when ad 'usting the same, whereby tjhey will allow the interiorbore el' said bushings to more nearly contact' with the entire 'surface of the drive shaft for which they form bearings.

1. The combination of a casing, a reciprocatory crosshead guided in the casing, a crank shaft journaled in the casing, and having its throw working in the crosshead, a

sliding cylindrical body located in advance of the crosshead, a tool carrying chuck cnnnected with' the cylindrical body and extending through the casing, a hollow piston sliding within the cylindrical body, having a piston rod extending through the rear end of the cylindrical body and connected with the crosshead and a piston shaft extending from the piston and the cylindrical body and having spiral groove and rib connectionjvith the tool carrying chuck, a ratchet wheel fixed to the piston shaft and confined within the piston and pawls hinged to the piston and adapted to engage the ratchet wheel.

2. The combinatibh of a casing having longitudinal grooves and journal box recesses, journa boxes located in the recesses, a reciprocatory crosshead guided by the longitudinal grooves, a crankshaft yjournaled in the journal boxes, and having .its 4throw working in the crosshead, a sliding cylindrical body located in advance of the crosshead, a \t'oo`l\ carryin chuck connected with the cyli'dri'cal bo through the forward end of t and extending through the ow piston sliding' within the 130 Cylindrical bod?, having a piston rod ex--l shaft and conned ,Within the piston, and tending tfhrougl drie-al body and connected with the crossengage tho ratchet Wheel.

head and ay piston Shaft extendin' from the ri, T T ,T I piston and through the forward 3nd of the I SEX MOLR FERGLSON v cylindrical bo( y and having spiral groove In the presence 3fand rib connection with the tool carrying LILY ROST,

chuck, a ratchet Whel xedto the piston E. M. HARRINGTON.

the rear end of the cylni pawls hinged to the piston and adapted to lo 

